Column.



H. O. DRUMM.

COLUMN.

APPLIGATION FILED JUNE Patented Mar. 9, 1915.

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@QEUHZNa ats-u Dpectfieatlon of Letters Patent.

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Patented Mar. 9, 19115.

Application also June a. ieia. semi no. roneoa.

To all whom it may concern.

Be it known that l, HERBERT G. primate, a citizen of the United States, residing at Canton, in the county of Stark? and State of Ohio, have invented certain new and useful improvements in Columns My invention relates to columns or more specifically the shaft portion of the column proper, and the objects of the present invention are, first, to produce iroxn sheet metal an entasis shaft formed from sheet metal, and second, to so form the sensor corrugations that the proper curvature is given to producean entasis shaft.

The above pointed out objects have to do with the shaft of the column propenthe purpose of so forming the shaft is to prevent the shaft of the column from appearing too slender and to destroy the optical illusion of concaved sides.

l attain these objects by the construction illustrated in the accompanying drawings, in which Figure 1 is a side elevation of the shaft portion or part of a column. Fig. 21s a longitudinal section. Fig; 3 is a bottom end view. Fig. 4 is a transverse section on line i 1, Fig. 1. Fig, 5 is a top end view.

Similar numerals of reference indicate correspondin parts throughout the several views of the drawings.

The shaft 1 constitutes a portion or part of a column proper and is formed from sheet metal and may be of any desired size, reference being had to the purpom or particular use intended. The shaft 1 is preferably fluted throughout its entire length and as shown the flutes are made up of a series of convexo-concave portions, which portions constitute the body or shell of the column shaft. it will be understood that the longitudinal edges of the shaft are to be united by any suitable seam such as 2 or any mechanical equivalent thereof. lhe method or manner of connecting the longitudinal edges of the shaft does not have to do with the present invention, except that the longitudinal edges should be properly connected together, so as to produce a proper structure of the class to which this invention pertains. The flutes 3 are somewhat more distinct or deeper at the bottom or lower portion of the shaft than they are in the middle or intermediate portion thereof and the flutes 3 at the top or upper end of the shaft are still more distinct while at the intermediate or central portion of the shaft the flutes are less distinct and more shallow than they are at the bottom or top ends of the shaft, by thus forming the flutes 3, that is to say the flutes more shallow in the mid die or intermediate portion of the shaft than at its ends. The shaft also is given the desired, curvature or in other words an entasis shaft is produced. This result is made possible in these orders. The upper diameter is made quite considerably less than the lower diameter and the column or shaft is tapered or swelled in outline. The intermediate or central portion of the column having a greater diameter than the upper end, but the smaller and larger diameters although variable have a certain relation that gives to the shaft the proper architectur'al appearance.

it will he understood that the more distinct the flutes or the deeper the concaveconvex portions are, the less the length or distance of the circumference of the column or in other words by increasing the depth of the flutes the diameter of the shaft is decreased, whereby the curvature of the shaft is regulated and determined by the distinc-' tiveness of. the flutes or convexo-concave portion 3. in use a predetermined curvature is established by the different depths of the flutes between their ends. The determination of the curvature being based upon the length and diameter and the length and size of the shaft in cross section.

it will be understood that the curvature of the shaft in order to give the proper architectural appearance and design may vary:

with the length or diameter of the shaft.

it will be understood that by forming the shaft from sheet metal various sized shafts can be produced giving to each shaft the proper curvature regardless of its length 01'' diameter or in'other words maintaining the same general appearance in various sized shafts.

It will be understood that the length of the entasis or curved portion of the column must necessarily vary, reference being had to the length of the entire column and the diameter in order to carry out the proper architectural proportions, but the flutes are curved from end to end throughout the entire entasis portion of the column or shaft, regardless of the length of such entasis or curved portion.

In the manufacture of the column, devices must be employed to produce the proper curvature ofthe column and in order to give the desired curvature, it is necessary to employ means whereby the corrugations are varied as to depth intermediate the ends of said corrugations. The better way to bring about this result is to provide a forming roll which travels back and forth upon the variousflutes or corrugations, which roll produces the necessary pressure to give the corrugations their proper longitudinal curvature.

It will also be understood that suitable die-bars must be employed and held in fixed position and the die-bars curved to correspond with the curvature desired to be given to the-corrugations. In place of the curved die-bars above described, straight die-bars may be employed and the carriage carrying the forming roll or rolls may be held in guides which impart not only longitudinal or reciprocating movement to the carriage ,and rolls, but movement to and from the straight fixed die. a

It will be understood that in order to give the proper architectural efifect to the column, the curvature must necessarily be changed, reference being had to the length and the diameter or the column. Consequently different die-bars,-or diderent guideways must be employed for difierent sized columns; otherwise the proper curvature would not be brought about to produce the true entasis curvature.

Having fully described my invention what I claim as newand desire to secure by Letters Patent, is-

1. As an improved article of manufacture, an entasis column formed of sheet metal, the body of said column provided with shallow flutes between its ends and the flutes of greater depth in the end portions thereof, said flutes curved longitudinally.

2. An entasis'column consisting of a sheet metal body portion, said body portion provided with corrugations, the corrugations in the central portion of the column being less in depth than the corrugations in the end portions thereof, the corrugations extended from the central portion continued in diflierent degrees of depth in opposite directions, '1

said corrugations curved throughout the entire length 3. As an improved article of manufacture, an entasis column made of sheet metal and corrugated longitudinally, the valleys of the corrugations in the longitudinal central portion of the column being of less depth than the end portions of said corrugations.

As an improved article of manufacture,

an entasis column made of sheet metal 'and 

